Hi, We haven't updated performance numbers for a while, thanks for pointing this out.
I'll make measurements on the machine that I have and will post the results here. And we'll update the "official" numbers a bit later. AVX512 is indeed ideal target for ISPC. Though a few factors need to be taken into account. AVX512 triggers lower frequencies than AVX2, which contributes to less-than-expected scaling factor when going to 16 lanes. We also have AVX512 8-wide target, which doesn't triggers frequency problem. Right now the most common platform with AVX512 is server Skylake platform (Purley). AVX512 is also available on the client in Ice Like chips (since recently), but unfortunatelly I don't have such machines within my reach. It would be very interesting to experiment with their performance. But they are *client* chips, which means they have fewer AVX execution units, than server parts. I'll run tests on Skylake server and post it here. Dmitry. On Wed, Sep 25, 2019 at 3:43 PM bb3141 <[email protected]> wrote: > Hi, > > the speedup of ISPC-vectorized is very impressive and for SSE and AVX, > many of the examples show near ideal 4x and 8x scaling with the SIMD width. > > So I'm very interested in the results of the 16 wide AVX512 for the common > ISPC examples (like aobench and ray-tracer). > In theory, AVX512 should be the ideal hardware for ISPC with a potential > of sixteen times speedup. (the only limiting factor would be memory > bandwidth). > > Am I missing something or are the AVX512 results not reported in the > "performance" paper ? > > Does anyone have some numbers that comprae the speedup (esp. with respect > to 8 wide AVX2) > or build an run the examples on a AVX512 capable machine ? > > Thanks & Regards, > bb3141 > > > > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Intel SPMD Program Compiler Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/ispc-users/7405df17-7632-4b1e-bd8a-5da48ca8a8f9%40googlegroups.com > <https://groups.google.com/d/msgid/ispc-users/7405df17-7632-4b1e-bd8a-5da48ca8a8f9%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Intel SPMD Program Compiler Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/ispc-users/CACRFwug1-ch5kZ%2BS8_6Vus_psv0sLjf37ixCnBb6hhYMT08NEQ%40mail.gmail.com.
